MEIOSIS

Number of Chromosomes Somatic Cells (Body Cells) Diploid Cells total # of homologous chromosomes chromosomes FLY 8 4 pairs CAT 38 19 pairs ONION 16 8 pairs HUMAN 46 23 pairs

4N FERTILIZATION

Meiosis A form of cell division that makes haploid daughter cells from a diploid parent cell.

Recap: Homologous Chromosomes Identical Gene For eye colour Gene For eye colour Homologous chromosomes code for similar information but perhaps different variations Eg. Both code for eye colour: Dad for brown eyes Mom for blue eyes

PROPHASE I

Crossing-Over

METAPHASE I How are the chromosomes lined up differently here compared to mitosis metaphase?

ANAPHASE I Compare with anaphase in mitosis

TELOPHASE I Are the new two cells formed genetically identical? Are they haploid or diploid?

PROPHASE II

METAPHASE II How does this compare to metaphase I of meiosis? How does this compare to metaphase of mitosis?

ANAPHASE II

TELOPHASE II

SPERMATOGENESIS

OOGENESIS